Myself, I don't believe the "radio" questions are a problem but more of a member's failure to search. There is a radio forum on "RC Car Talk" forum as well as "Radios, Engines, Batteries, Clubhouse and more" which also has specific manufacturer sub-forums. Of course, you already know that though radio questions seem to be found in any area of "RC Car Talk".

Have you visited the "Mini & Micro RC Cars" section? I suggested this during the last reorganization and I'll suggest it again, the Mini-T needs its own subforum because there are simply so many threads dealing with the Mini-T. Many times, members either don't search, fail to properly search, or simply start a new thread because they don't want to read past posts or expect an answer "right now".

I've also noticed that even when there is a specific subform, i.e. T-Maxx or Savage, members still ask "brand" questions on the other non-specific forums. Of course, I anticipate that will probably happen no matter how many specific or general forums are set up.